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Philomi nathan Pitchai

Philomi nathan Pitchai
Annai Vailankanni Arts and Science College · Head of the institution

PhD

About

77
Publications
95,959
Reads
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1,090
Citations
Citations since 2016
18 Research Items
663 Citations
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
2016201720182019202020212022020406080100
Introduction
Philomi nathan Pitchai currently works at Annai Vailankanni Arts and Science College( Affiliated to Bharathidasan University, Trichirappalli). Philomi nathan does research in Fluid Dynamics, Materials Physics and Theoretical Physics.
Additional affiliations
July 2014 - July 2016
AVVM Sri Pushpam College
Position
  • Managing Director
Description
  • * 25 years of teaching experience at UG and PG level Physics * At present, administring Department of management studies
June 2014 - July 2016
AVVM Sri Pushpam College
Position
  • Managing Director
June 2009 - May 2014
AVVM Sri Pushpam College
Position
  • Head of the Department of Physics
Education
January 1986 - April 1990
Bharathidasan University
Field of study
  • Nonlinear Dynamics
June 1983 - April 1985
Bharathidasan University
Field of study
  • Physics
July 1980 - April 1983
University of Madras
Field of study
  • Physics

Publications

Publications (77)
Article
Full-text available
In this manuscript various components of research are listed and briefly discussed. The topics considered in this write-up cover a part of the research methodology paper of Master of Philosophy (M.Phil.) course and Doctor of Philosophy (Ph.D.) course. The manuscript is intended for students and research scholars of science subjects such as mathemat...
Article
We introduce a model to mimic the dynamics of oscillators that are coupled by mean-field nonlinear memductance. Notably, nonlinear memductance produces dynamic nonlinearity, which causes the direction of coupling to change over time. Depending on the parameters, such a dynamic coupling drives the trajectory of oscillators to a synchronization or an...
Article
This paper presents a Quantum encryption technique which is built by adopting Haar Integer Wavelet Transform (HIWT), RC6 (Rivest Cipher) block cipher and DNA (deoxyribonucleic acid) sequences. A Unified Chaotic Logistic Tent Map (ULTM) has been employed in the permutation phase to produce the pseudo-random sequence for shuffling the RGB planes of t...
Article
Full-text available
The l-glutamic acid thin films prepared using a lucrative process simplified spray pyrolysis (or) perfume atomizer technique. The absorption coefficient, refractive index, extinction coefficient, imaginary and real parts of dielectric constant, electrical and optical conductivity, optical polarization, electrical and optical susceptibility were ins...
Article
We examine the existence of multiple vibrational resonance (VR) and antiresonance in two coupled overdamped anharmonic oscillators where each one is individually driven by a monochromatic sinusoidal signal with widely separated frequencies (\(\Omega \gg \omega \)). In contemporary VR, superposed periodic waves are adopted to infer resonance, but he...
Article
The Guanidine carbonate thin films were deposited with a cost-effective method, namely simplified spray pyrolysis (or) perfume atomizer technique. The analyzes of nonlinear optical properties of thin films were carried out using the Z-scan and Eclipse Z-scan experiments. The linear optical properties such as linear refractive index, linear extincti...
Article
Full-text available
The present study uncovers the hyperchaotic dynamical behavior of the famous Murali-Lakshmanan-Chua (MLC) circuit, when suitably modified. In the conventional MLC oscillator, an inductor is introduced in parallel between the nonlinear element and the capacitor. Many novel and interesting dynamical behaviors such as reverse period-3 doubling, torus...
Article
Full-text available
An organic nonlinear single crystal of Nitrilotriacetic acid (NTAA) was grown for the first time by employing a simple slow evaporation technique. Single crystal X-ray diffraction (XRD) analysis reveals that the grown crystal belongs to the monoclinic system with noncentrosymmetric space group (Formula presented.). Fourier transform infrared (FTIR)...
Article
Full-text available
Nanocrystalline Ag-doped indium oxide (AIO) thin films, by employing a much simplified spray pyrolysis technique in different substrate temperatures (300, 350, 400 and 450°C), were fabricated for the first time. The deposited films were subjected to various characterization studies, to explore certain features like the influence of various depositi...
Article
Full-text available
This paper deals with the generation of chaotic beats in a system of two forced dissipative LCR oscillators sharing a nonlinear element. The presence of two external periodic excitations and a common nonlinear element in the chosen system enables the facile generation of chaotic beats. Thus rendered chaotic beats were characterized in both time dom...
Article
Full-text available
This paper addresses the problem of sharing common nonlinearity among nonautonomous and autonomous oscillators. By choosing a suitable common nonlinear element with the driving point characteristics capable of bringing out chaotic motion in a combined system, we obtain identical chaotic states. The dynamics of the coupled system is explored through...
Article
A biocompatible non-linear optical crystals (458 × 7 mm) of nicotinic acid-doped potassium dihydrogen phosphate (KDP) were grown by the slow evaporation technique at room temperature and their structural study was confirmed by single-crystal X-ray diffraction. Further, the presence of functional groups and elements were verified using Fourier trans...
Article
Full-text available
This paper investigates the dynamics of four-dimensional autonomous oscillator with antiparallel diodes. A rare phenomenon of volume-expanding phase space is observed from the proposed model, and the only equilibrium point at the origin is found to be a repeller. Systems of this kind pave the way for the better understanding of repellers. In additi...
Article
Full-text available
An organic nonlinear optical (NLO) single crystal of Pyridine 3-carboxylic acid, which has potential application in a variety of fields was grown by solution growth technique. The single crystal X-ray diffraction analysis confirms that the grown crystals possess lattice parameters of monoclinic system of space group (P21/c). The Fourier transform i...
Conference Paper
Full-text available
This report deals with the resonant interaction of mutually driven (with widely different frequencies) LCR oscillators sharing a common nonlinear element. The response of the system at the low frequency component is amplified by an optimum high frequency amplitude. Response amplitude is calculated from the power spectral density of the low frequenc...
Article
Full-text available
In this work, we present the results of photoluminescence (PL) by the Ag doped In2O3 thin films prepared by a cost-effective and much simplified perfume atomizer technique. The PL emission behavior was investigated using three distinct excitation wavelengths (350 nm, 450 nm and 550 nm) upon the deposited films coated in a temperature range of 300°...
Article
Full-text available
The development of atmospheric disturbances in the tropical region is explained using vibrational resonance, a nonlinear phenomenon. As the Lorenz system is the most plausible model to describe the convective process in a tropical region, the influence of vertical wind shear and tropical waves on the system leading to tropical cyclone has been inve...
Article
Full-text available
The organic nonlinear optical (NLO) crystals of Guanidinium Carbonate (GC) were grown by the slow evaporation technique. X-ray diffraction studies reveal the tetragonal structure of the grown crystal. The characterization analysis such as powder XRD and Fourier transform infra-red (FTIR) spectral analysis were carried out to find the crystalline na...
Article
Full-text available
In this paper, a novel type of network called network sharing common nonlinearity comprising both autonomous and non-autonomous oscillators have been investigated. We propose that these networks are robust for operating at desired modes i.e., chaotic or periodic by altering the v–i characteristics of common nonlinear element alone. The dynamics of...
Article
Full-text available
Titanium dioxide nanoparticles (TiNPs) were emerged as wound healing enhancer as well as an antibacterial agent against Gram-positive and Gram-negative bacteria due to its enhanced mechanical properties. Moreover, the green synthesized Titanium dioxide exhibited significant wound healing activity in Albino rats which was confirmed by measuring woun...
Article
Full-text available
Thin films of binary oxides (TiO2-MoO3) of varied molar concentrations of MoO3 (from 0.15 M to 0.30 M insteps of 0.05 M) have been prepared by a simplified and cost effective perfume atomizer technique on quartz substrates at 500˚C. To investigate the structural, morphological, photoluminescence, optical and gas sensing properties of as-deposited f...
Article
Full-text available
Transparent conducting binary MoO 3-In 2 O 3 as-deposited and annealed thin films, well suited for window layers were fabricated by employing a simple and inexpensive spray pyrolysis technique using perfume atomizer. The effect of Mo concentration (0.2-3 at. %) on the structural, morphological, optical and photoluminescence properties of the binary...
Article
Full-text available
In this work, we have reported the effect of annealing temperature on structural, optical, electrical, and photoluminescence properties of the nanocrystalline copper doped indium oxide thin films prepared by simplified spray pyrolysis technique using perfume atomizer. XRD reveals that the films are polycrystalline with cubic structure. Photolumines...
Article
Full-text available
A novel ternary oxide compound magnesium indate film was deposited by quartz substrate, temperature fixed at 500 K MgIn 2 O 3 (MIO) manifesting high transparency has been prepared by simplifying spray pyrolysis using perfume atomizer technique. The Mg doping was varied between 0 and 3 at. %. The films were characterized by their structural, morphol...
Article
Full-text available
We wish to present a comparative report of copper doped indium (CIO) and silver doped indium oxide (AIO) thin films interms of crystallization, electrical and optical propreties as it will be a boon for the applicability in transparent conducting oxide devices. Cu doped InO and Ag doped InO thin films were deposited on glass substrates (corning 173...
Article
Full-text available
Ti doped indium oxide thin films (I n2 O3 :Ti) were prepared at different temperatures by a simplified spray pyrolysis technique using perfume atomizer technique. The effect of substrate temperature on structural, electrical, photoluminesence and optical properties of these films have been analyzed and reported here. The XRD analysis revealed that...
Article
Full-text available
We wish to report the occurrence of vibrational resonance in certain discrete systems like sine square map and sine circle map, in a unique fashion, comprising of multiple resonant peaks which pave the way for enrichment. As the systems of our choice are capable of exhibiting vibrational resonance behaviour unlike the earlier reports, they are take...
Article
Full-text available
Pure and titanium doped indium oxide (TIO) thin films were prepared by a low cost and simplified spray pyrolysis method employing a perfume atomizer. The XRD analysis showed that these films have cubic structure of polycrystalline In 2 O 3 phase.A high mobility (69 cm 2 /Vs), lower resistivity (1.12 × 10-4 Ωcm), high figure of merit (2.02×10-3 Ω-1)...
Article
Full-text available
In this present work, we intend to report the results of pure and copper doped indium oxide (CIO) thin films fabricated using a cost-effect perfume atomizer technique (as it has not been reported elsewhere). The XRD results reveal that the films are of polycrystalline with cubic structure. An optical transmission of 97% in visible-NIR (near infrare...
Article
Full-text available
In this paper, we report a variety of dynamical behaviors exhibited in a compact series–parallel LC circuit system comprising of two active elements, one linear negative conductance and one ordinary junction diode with piecewise linear v − i characteristics. For convenience, we consider the amplitude (Ef) and frequency (f) of the driving force as c...
Article
Full-text available
Microorganisms live in very low Reynolds number environments where viscous forces dominate over inertial forces. The physics of motion in this flow regime is different from others through properties like instantaneity, time reversibility and superposability demanded by the governing Stokes equations. Modem computational fluid dynamics methodology o...
Article
Full-text available
Purcell’s swimmer was proposed by E. M. Purcell to explain bacterial swimming motions. It has been proved experimentally that a swimmer of this kind is possible under inertial-less and high viscous environment. But we could not investigate all the aspects of this mechanism through experiments due to practical difficulties. The computational fluid d...
Article
Full-text available
Single crystal of lithium potassium sulphate, a nonlinear optical material, was grown from aqua solution by slow evapo-ration method at room temperature. The cell parameters were estimated by single crystal X-ray diffraction analysis. The optical transmittance of the crystal was recorded using the UV-Vis-NIR spectrophotometer and the optical band g...
Article
Full-text available
ABSTRACT Sodium thiourea bromide (STB), a new semiorganic nonlinear optical material, has been synthesized and single crystals were grown from aqueous solution. The FT-IR spectrum confirms the compound formation. Single crystals of STB have been grown by slow evaporation of solvent at room temperature. The grown crystal was subjected to single crys...
Article
Full-text available
Sodium thiourea bromide (STB), a new semiorganic nonlinear optical material, has been synthesized and single crystals were grown from aqueous solution. The FT-IR spectrum confirms the compound formation. Single crystals of STB have been grown by slow evaporation of solvent at room temperature. The grown crystal was subjected to single crystal X-ray...
Article
Full-text available
By making use of the developments in the fields of numerical methods, computational technology and fluid dynamics models, computational fluid dynamics (CFD) progress forward to play an active role today in various industrial, academic and research activities. In many cases, CFD simulations replace expensive and time consuming laboratory experiments...
Article
Full-text available
The study of bacterial flagellar swimming motion remains an interesting and challenging research subject in the fields of hydrodynamics and bio-locomotion. This swimming motion is characterized by very low Reynolds numbers, which is unique and time reversible. In particular, the effect of rotation of helical flagella of bacterium on swimming motion...
Article
Full-text available
Single crystals of para Nitroaniline (pNA), an organic nonlinear optical (NLO) material, have been grown by slow solvent evaporation technique at room temperature. Good optical quality single crystals with dimensions of up to 10 × 11 × 3 mm3 have been grown by adopting the above technique, and good quality single crystals were obtained. The grown s...
Article
Full-text available
We present the results of a very simple nonlinear nonautonomous parallel LCR circuit which exhibits a rich variety of bifurcations and chaos. This simple experimental chaotic oscillator is made up of a few passive components and a uniquely designed nonlinear element comprising of a junction diode and Op-amp based negative conductor. The system exhi...
Article
Full-text available
In this paper, we report the dynamical behaviors of a four-dimensional autonomous system, that is, the modified canonical Chua's circuit. An interesting transition of three-tori–period-3 doubling–chaos is observed when the circuit parameters are varied in the range of our choice. Furthermore, the detailed numerical studies of the system behavior wi...
Article
Full-text available
We introduce a simple parametrically driven dissipative second-order chaotic circuit. In this circuit, one of the circuit parameters is varied by an external periodic control signal. Thus by tuning the parameter values of this circuit, classic period-doubling bifurcation route to chaos is found to occur. The experimentally observed phenomena is fur...
Article
Full-text available
Antimony doped nanocrystalline tin oxide (SnO2:Sb) films have been fabricated using a low cost and simple fabrication technique using a perfume atomiser. The X-ray diffraction patterns of the antimony doped tin oxide (ATO) films show that the films are polycrystalline with tetragonal cassiterite structure having (110) plane parallel to the surface...
Article
Full-text available
EM Purcell proposed three-linked swimmer 60 years ago as a hypothetical creature capable of swimming in highly viscous fluid. We have constructed a scaled model of this swimmer to investigate reciprocal and non-reciprocal swimming motion. The links were programmatically rotated by the interactive servomotors controlled by a microcomputer. Reciproca...
Article
Full-text available
Antimony doped tin oxide films are fabricated using a simplified and inexpensive spray pyrolysis technique. The variation in the sheet resistance, as a function of Sb/Sn ratio in the spraying solution, is studied. The sheet resistance decreases with the increase in doping level, attains a minimum at a particular doping level and increases with furt...
Article
Full-text available
This paper suggests a simple mechanism of sharing a common nonlinearity among the linear oscillators to exhibit some interesting phenomena. Here, we present fourth-order nonautonomous circuit capable of showing a large variety of dynamical behaviors in three different modes of operation. In particular, a new phenomenon of coexistence of attractors...
Article
Full-text available
Single crystals of glycine doped potassium acid phthalate (KAP) have been grown from low temperature solution growth method by employing slow evaporation of the solvent at room temperature. The grown crystal was subjected to various studies such as X-ray diffraction (XRD), Fourier Transform Infrared (FTIR), UV-visible and Second Harmonic Generation...
Article
Full-text available
A nonlinear optical crystal of gamma glycine was grown by slow evaporation solution growth technique using deionized water and sodium acetate. The functional groups and vibrational frequencies were identified using FTIR spectral analysis. The cell parameters were determined from single crystal X-ray diffraction analysis. Thermogravimetric analysis...